glances_processlist.py: minor fixes

- Attribute 'tag_proc_time' defined outside __init__
- Catch the correct exception (OverflowError)
- Display '?' if no CPU times are available

glances/plugins/glances_processlist.py

@@ -58,6 +58,9 @@ class Plugin(GlancesPlugin):
         # We want to display the stat in the curse interface
         self.display_curse = True
 
+        # Trying to display proc time
+        self.tag_proc_time = True
+
         # Note: 'glances_processes' is already init in the glances_processes.py script
 
     def get_key(self):
@@ -237,7 +240,7 @@ class Plugin(GlancesPlugin):
         if self.tag_proc_time:
             try:
                 delta = timedelta(seconds=sum(p['cpu_times']))
-            except Exception:
+            except OverflowError:
                 # Catched on some Amazon EC2 server
                 # See https://github.com/nicolargo/glances/issues/87
                 self.tag_proc_time = False
@@ -248,7 +251,7 @@ class Plugin(GlancesPlugin):
                 else:
                     msg = '{0}:{1}.{2}'.format(minutes, seconds, microseconds)
         else:
-            msg = ' '
+            msg = '?'
         msg = '{0:>10}'.format(msg)
         ret.append(self.curse_add_line(msg, optional=True))
         # IO read/write
@@ -409,9 +412,6 @@ class Plugin(GlancesPlugin):
         msg = ' {0:8}'.format(_("Command"))
         ret.append(self.curse_add_line(msg))
 
-        # Trying to display proc time
-        self.tag_proc_time = True
-
         if glances_processes.is_tree_enabled():
             ret.extend(self.get_process_tree_curses_data(
                 self.sort_stats(process_sort_key), args, first_level=True,